Litter box



FIG. 1 is a front, left, and top perspective view of a litter box, showing my new design;

FIG. 2 is a rear, right, and bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines shown in the drawings are included for the purpose of illustrating portions of the litter box that form no part of the claimed design. 

CLAIM The ornamental design for a litter box, as shown and described. 